#include "reg52.h"

typedef unsigned int u16;	
typedef unsigned char u8;

#define KEY_MATRIX_PORT	P1	
#define SMG_A_DP_PORT	P0	

u8 gsmg_code[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
				0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};	

void delay_10us(u16 ten_us)
{
	while(ten_us--);	
}

u8 key_matrix_ranks_scan(void)
{
	u8 key_value=0;

	KEY_MATRIX_PORT=0xf7;
	if(KEY_MATRIX_PORT!=0xf7)
	{
		delay_10us(1000);
		switch(KEY_MATRIX_PORT)
		{
			case 0x77: key_value=1;break;
			case 0xb7: key_value=5;break;
			case 0xd7: key_value=9;break;
			case 0xe7: key_value=13;break;
		}
	}
	while(KEY_MATRIX_PORT!=0xf7);
	
	KEY_MATRIX_PORT=0xfb;
	if(KEY_MATRIX_PORT!=0xfb)
	{
		delay_10us(1000);
		switch(KEY_MATRIX_PORT)
		{
			case 0x7b: key_value=2;break;
			case 0xbb: key_value=6;break;
			case 0xdb: key_value=10;break;
			case 0xeb: key_value=14;break;
		}
	}
	while(KEY_MATRIX_PORT!=0xfb);	
	
	KEY_MATRIX_PORT=0xfd;
	if(KEY_MATRIX_PORT!=0xfd)
	{
		delay_10us(1000);
		switch(KEY_MATRIX_PORT)
		{
			case 0x7d: key_value=3;break;
			case 0xbd: key_value=7;break;
			case 0xdd: key_value=11;break;
			case 0xed: key_value=15;break;
		}
	}
	while(KEY_MATRIX_PORT!=0xfd);
	
	KEY_MATRIX_PORT=0xfe;
	if(KEY_MATRIX_PORT!=0xfe)
	{
		delay_10us(1000);
		switch(KEY_MATRIX_PORT)
		{
			case 0x7e: key_value=4;break;
			case 0xbe: key_value=8;break;
			case 0xde: key_value=12;break;
			case 0xee: key_value=16;break;
		}
	}
	while(KEY_MATRIX_PORT!=0xfe);
	
	return key_value;		
}

u8 key_matrix_flip_scan(void)
{
	static u8 key_value=0;

	KEY_MATRIX_PORT=0x0f;
	if(KEY_MATRIX_PORT!=0x0f)
	{
		delay_10us(1000);//Ïû¶¶
		if(KEY_MATRIX_PORT!=0x0f)
		{
			//²âÊÔÁÐ
			KEY_MATRIX_PORT=0x0f;
			switch(KEY_MATRIX_PORT)
			{
				case 0x07: key_value=1;break;
				case 0x0b: key_value=2;break;
				case 0x0d: key_value=3;break;
				case 0x0e: key_value=4;break;
			}
			//²âÊÔÐÐ
			KEY_MATRIX_PORT=0xf0;
			switch(KEY_MATRIX_PORT)	
			{
				case 0x70: key_value=key_value;break;
				case 0xb0: key_value=key_value+4;break;
				case 0xd0: key_value=key_value+8;break;
				case 0xe0: key_value=key_value+12;break;
			}
			while(KEY_MATRIX_PORT!=0xf0);
		}
	}
	else
		key_value=0;		
	
	return key_value;		
}

void main()
{	
	u8 key=0;

	while(1)
	{
	   	key=key_matrix_ranks_scan();
		if(key!=0)
			SMG_A_DP_PORT=gsmg_code[key-1];		
	}		
}